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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4469d96ead9173de1a9fe6a26b2f584bb7813735564e4439d669b16e7fcf9717' 
  AND token = '0WGVRSVoj1FiDBPfL9jo6wbd/JqkB8PTtG7u9EjkixI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}